On server, the search queries are executed in the same JVM as Jira. In the cloud, JQL Search Extensions service is a completely separate deployment that communicates with Jira over the REST API.
As a result, all operation in the cloud are indexed asynchronously and any changes in Jira are reflected in the JQL with a slight delay. Please keep in mind that filters are indexed periodically, and you can learn more about filter limitations here.
The service is maintained and supported entirely by our experienced technical team.